-- https://dev.mysql.com/doc/refman/8.0/en/set-transaction.html

/* SET [GLOBAL | SESSION] TRANSACTION
    transaction_characteristic [, transaction_characteristic] ...

transaction_characteristic: {
    ISOLATION LEVEL level
  | access_mode
}

level: {
     REPEATABLE READ
   | READ COMMITTED
   | READ UNCOMMITTED
   | SERIALIZABLE
}

access_mode: {
     READ WRITE
   | READ ONLY
} */


START TRANSACTION;

SET GLOBAL TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SET GLOBAL TRANSACTION ISOLATION LEVEL REPEATABLE READ, ISOLATION LEVEL REPEATABLE READ;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
SET GLOBAL TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET GLOBAL TRANSACTION READ WRITE;
SET SESSION TRANSACTION READ ONLY;

SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;